Does sound a bit strange, but as the DCF standard recommends: If a DCF file name already exists in the DCF directory where a file is to be stored, it
is recommended that the file number be assigned as the largest existing number +
1. (same goes for folder number).
Sounds a bit of a bug in that Fuji determine this number when the card is inserted, but then doesn't reset if a format is done.
x-pro 1, x-100, m8, k5, lx5, bessa R2, FED3, ep1,
35mm Summicron ASPH, 28mm M-Hexanon, 50mm F1.5 VC, 75mm F1.8 VC, 15mm F4.5 VC